Lightning Strike Detection Using Pollable RFID Tags
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Solution Overview
Problem
Composite aircraft structures are vulnerable to lightning strikes, as they do not effectively conduct away electrical currents and electromagnetic forces, leading to hidden damage that is difficult to detect through visual inspection, requiring time-consuming and expensive non-destructive inspection of large areas.
Innovation Solution
Deployment of small, lightweight, pollable communication devices, such as RFID tags, arranged in patterns over susceptible regions to detect lightning strikes by rendering inoperative devices proximate to lightning current, allowing for rapid identification of affected areas and paths of current flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If non-destructive inspection is performed on very large areas to detect hidden damage, then detection completeness is improved, but inspection time and cost increase significantly
Solution Approach 1:
The aircraft structure is divided into multiple zones, each monitored by distributed communication devices. Instead of inspecting the entire structure uniformly, the system segments the inspection task into zone-level monitoring units, allowing parallel detection across multiple areas simultaneously.
Solution Approach 2:
Communication devices are installed in advance throughout the aircraft structure before flight. These devices continuously monitor for lightning strikes and record damage locations, so that when inspection is needed, the system already has preliminary data about where damage occurred, eliminating the need for exhaustive full-structure inspection.
2Measurement precision
If non-destructive inspection is performed on very large areas to detect hidden damage, then detection completeness is improved, but inspection cost increases significantly
Solution Approach 1:
The monitoring system is segmented into multiple independent communication devices distributed across the aircraft. Each device independently monitors its local zone, allowing the system to achieve complete detection coverage without requiring expensive centralized inspection equipment for entire large areas.
Solution Approach 2:
The communication devices autonomously detect and record lightning strike damage in their respective zones without requiring continuous human intervention or expensive external inspection equipment. The system serves itself by providing continuous monitoring capability that eliminates the need for costly periodic comprehensive inspections.
3Area of stationary object
If lightweight communication devices are deployed to monitor large areas, then detection coverage is improved, but device vulnerability to lightning current increases
Solution Approach 1:
The monitoring function is segmented across multiple lightweight communication devices rather than using a single heavy-duty system. Each device is designed to be lightweight for easy deployment across large areas, and the distributed architecture ensures that if some devices are damaged by lightning, others continue to provide coverage.
Solution Approach 2:
The system accounts for potential lightning damage in advance by deploying redundant communication devices throughout the structure. If lightning renders some devices inoperative, the pre-deployed redundant devices ensure continuous monitoring coverage, cushioning against the reliability loss from individual device failures.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables quick and cost-effective detection of lightning strike damage, reducing the need for extensive inspections and providing immediate assessment of structural health, both in-flight and on the ground, thereby enhancing safety and reducing maintenance costs.
Implementation Method 1
Aircraft with composite structures may be equipped with lightning strike protection (LSP). For example, conductive media may be provided on a surface or in a structure to divert and distribute lightning current.
Data Source
AI summary
An aircraft includes a composite structure and a plurality of small lightweight pollable communication devices for providing lightning strike detection coverage of a region of the structure. Each device is rendered inoperative if at least proximate to lightning current.